Modern C++

int* pi = new int;

int i;

int* arr = new int[1024];

std::array<int, 1024> arr;

int* arr = new int[n];

std::vector<int> arr(n);

char* str = new char[1024]

std::string str;

void draw_shape(Shape const* shape);
draw_shape(new Rectangle);

void draw_shape(Shape const& shape);
draw_shape(Rectangle());

huge_object* build_new_object() {
  huge_object* ret = new huge_object;
  …
  return ret;
}

huge_object build_new_object() {
  huge_object ret;
  …
  return ret;
}

struct owner {
  resource* pr;
  owner() : pr(new resource) { }
  ~owner() { delete pr; }
};

struct owner {
  std::unique_ptr<resource> r;

  owner() : r(new resource) { }
};

struct owner {
  resource* pr;
  owner() : pr(new resource) { }
  ~owner() { delete pr; }
};

struct owner {
  std::shared_ptr<resource> r;

  owner() : r(make_shared()) {}
};

Pointers

must. not. own.

resources.